LG 55EC930V power supply problem

[Teletoby]

Hi folks, I am having a problem with a LG 55EC930V. I've checked the power supply, and it only delivers 3,5V. When i bridge the PWR_ON with 3.5V, i ain't got any power at the 12V ans 24V outputs. When i bridged the DRV_ON to start the 24V panel output, i also get no voltage. The power supply is the EAY63348801 B12D198801, but i have no idea where to start fixing the power supply.

[budm]

Re: LG 55EC930V power supply problem

1) So when you bridge (force on) the connection, did you disconnect the cable between the power supply board and the main board first?
2) We need pictures of the whole backside of the TV showing all the boards, and pictures of the the whole board of the power supply board.

[Teletoby]

Re: LG 55EC930V power supply problem

1) So when you bridge (force on) the connection, did you disconnect the cable between the power supply board and the main board first?

Yes i did... the power supply was completely removed from the TV.

Pictures will be uploaded soon...

[R_J]

Re: LG 55EC930V power supply problem

Check F101 and F102 fuses, check the voltage on one of the main filter caps (C620) F501 will be ok if you have standby voltage

[Diah]

Re: LG 55EC930V power supply problem

when you make contact to turn on 12 & 24 V you should hear relay Click. if no Click then you have open SMPS

follow this trouble shooting for yours OLED TV

[Teletoby]

Re: LG 55EC930V power supply problem

when you make contact to turn on 12 & 24 V you should hear relay Click. if no Click then you have open SMPS

follow this trouble shooting for yours OLED TV

The Relay makes a click... but no voltage, and then after a few seconds the relay clicks on and off and on and off, and when i unplug the plug, it becomes faster and faster, until the capacitor is running out of energy i guess then it stops.

By the way, this file, i used to test the power supply

[Diah]

Re: LG 55EC930V power supply problem

The Relay makes a click... but no voltage, and then after a few seconds the relay clicks on and off and on and off, and when i unplug the plug, it becomes faster and faster, until the capacitor is running out of energy i guess then it stops.

By the way, this file, i used to test the power supply

1-you need disconnect the socket between PWB and T-CON driver board, also MB should be out from any test connection
2- the first bridge you made for STB as point one 1 in pdf it should remain connected when you do the second bridge and the third
3- still waiting on very clear photo as suggested by other member to the PWB from both side.

[Teletoby]

Re: LG 55EC930V power supply problem

1-you need disconnect the socket between PWB and T-CON driver board, also MB should be out from any test connection
2- the first bridge you made for STB as point one 1 in pdf it should remain connected when you do the second bridge and the third
3- still waiting on very clear photo as suggested by other member to the PWB from both side.

Yes, i did it exactly as described in the PDF... and i got no other voltages then the 3,5VDC

Pictures are following...

[Teletoby]

Re: LG 55EC930V power supply problem

Here are the pictures. In the zip file are the HiRes pictures.

[Diah]

Re: LG 55EC930V power supply problem

check C564 , replace it with same or good esr type

[Teletoby]

Re: LG 55EC930V power supply problem

check C564 , replace it with same or good esr type

I will do that

[Teletoby]

Re: LG 55EC930V power supply problem

check C564 , replace it with same or good esr type

could you give me a hint where i can find it?

[Diah]

Re: LG 55EC930V power supply problem

could you give me a hint where i can find it?

at the primary section near to the 4 Opto

[Teletoby]

Re: LG 55EC930V power supply problem

at the primary section near to the 4 Opto

I am not sure which one you mean. I can't find any with this number.

[Diah]

Re: LG 55EC930V power supply problem

sorry C504 not 564

[Teletoby]

Re: LG 55EC930V power supply problem

sorry C504 not 564

I'll have a look!

[Teletoby]

Re: LG 55EC930V power supply problem

sorry C504 not 564

This is the Value of the C504 it seems to be ok!

[Diah]

Re: LG 55EC930V power supply problem

did you check it out of board?

[Teletoby]

Re: LG 55EC930V power supply problem

did you check it out of board?

Of course

[Diah]

Re: LG 55EC930V power supply problem

take new one and compare the Vlose % & ESR... replace it. if the PWB still no 12 24V replace the PWB. the issue at same section with some SMT component. such Q , the problem we cant find replacement parts.